Polyurea-based solid electrolyte and preparation method thereof

A polyurea-based solid electrolyte, wherein raw material components of the polyurea-based solid electrolyte comprise a first polyaspartic ester, a lithium salt, and an isocyanate curing agent;

• the first polyaspartic ester contains a first resin represented by formula (1),
• wherein R1 is a divalent organic group optionally containing one or more heteroatoms, obtained by removing a primary amino group from a corresponding polyamine having an aliphatically, cycloaliphatically, or araliphatically attached primary amino group and having an average molecular weight in a range of from 60 to 6000 g/mol, and optionally containing a further functional group at least one of reactive to an isocyanate group or inert at temperatures of up to 100° C.;
• R2, R3, R4, and R5 are independently selected from a C1-C18 alkyl group or a first polyethylene glycol ether group of a general formula —O(CH2CH2O)mR6, and at least one of R2, R3, R4, and R5 is the first polyethylene glycol ether group, wherein m=1-250, and R6 is a C1-C6 alkyl group;
• and
• a weight of the lithium salt is 3-30% of a weight of the first polyaspartic ester.